Features: 1) Thick resonant frequency:1.66&plumn;0.005mHz, 2) Resonant impedance: ≤2.0Ω 3) Static capacitance (pf):1,700&plumn; 20% 4) Electric-mechanical coupling coefficient (kt): ≥0.45 5) Fog output: 400ml/H 6) Life span: 5,000h 7) Applications: inhalators, medical nebulizers, cosmetic treatments, humidifiers, atomizers